65861965 has 16 divisors (see below), whose sum is σ = 85620528. Its totient is φ = 48347136.

The previous prime is 65861941. The next prime is 65861969. The reversal of 65861965 is 56916856.

It can be written as a sum of positive squares in 8 ways, for example, as 3988009 + 61873956 = 1997^2 + 7866^2 .

It is a cyclic number.

It is not a de Polignac number, because 65861965 - 2¹¹ = 65859917 is a prime.

It is a super-2 number, since 2×65861965² = 8675596867322450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65861969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8317 + ... + 14173.

It is an arithmetic number, because the mean of its divisors is an integer number (5351283).

Almost surely, 2^65861965 is an apocalyptic number.

65861965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65861965 is a deficient number, since it is larger than the sum of its proper divisors (19758563).

65861965 is a wasteful number, since it uses less digits than its factorization.

65861965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048.

The product of its digits is 388800, while the sum is 46.

The square root of 65861965 is about 8115.5384910676. The cubic root of 65861965 is about 403.8420718048.

The spelling of 65861965 in words is "sixty-five million, eight hundred sixty-one thousand, nine hundred sixty-five".